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Absolute vs. Relative VNA Measurement Uncertainty

Question asked by Andrew004 on Oct 27, 2015
Latest reply on May 26, 2016 by Dr_joel
Hi guys,

Our company has been really big on measurement uncertainty lately so this has been one of my big question marks that has come up. If I'm comparing two measurements in a sweep, will I use the VNA uncertainty twice in my RSS? Will it cancel out? If it cancels, what is an acceptable range in a VNA sweep that I can consider this case for? For example a gain/phase variation test where I'm comparing two values X Hz apart, I can't determine how I should handle the VNA uncertainty in these cases.